The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Jul. 14, 2015
Filed:
Jun. 13, 2014
Applicant:
Kureha Corporation, Tokyo, JP;
Inventors:
Assignee:
KUREHA CORPORATION, Tokyo, JP;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
C08G 63/78 (2006.01); C08G 63/87 (2006.01); C08G 63/85 (2006.01); C08G 67/04 (2006.01);
U.S. Cl.
CPC ...
C08G 63/87 (2013.01); C08G 63/85 (2013.01);
Abstract
A method to efficiently produce an aliphatic polyester and to improve the thermal stability of the resulting aliphatic polyester. A sulfonic acid compound is used as a co-catalyst at the time of a ring-opening bulk polymerization of a cyclic ester using a tin compound catalyst.